Warp stop motion for looms



Feb. 27, 1923 WARP STOP MOTION FOR LOOMS Filed July 10, 1919 2 sheets-sheet 1 C. H. DFXAPER WARP STOP MOTION FOR LOOMS 2 sheets-sheet 2 Filed July 10,

5 5 e a 7/ W Z Talented Feb. 27,1923) UNTTT STATES easer PATENT cranes.

CLARE H. DRAPER, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO HQPEDALE FACTURING COMPANY, OF MILFORD, MASSACHUSETTS, A CORPORATION 015 TJIASSA- CHUSE'TTS.

WARP STOP MOTION FOR LOOIVIS.

Application filed July 10, 1919. Serial No. 309,884.

To all whom it may canoe m:

Be it known that I, LCLARE H. DRAPER, a citizen of the United States, residing at Hopedale, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Varp Stop Motions for Looms; and I do hereby declare the followin to be a full, clear,'an'd exact description 0 the invention, such as will enable others skilled in the artto which it appertains to make and use the same.

This invention relates to an improvement in warp stop motions for looms.

In the ordinary warp stop motions for looms the individual warp threads pass through holes or eyes in the drop wires which are supported on drop wire bars rigidly secured to the supporting frame of the loom. The edges and walls of .the eyes of the drop wires are carefully ground and machined to remove burrs was to present a smooth surface to the warp threads in order to minimize the wear upon the threads as they are drawn through the eyes during the normal operation of weaving. Eachtime, however; that the shed is opened or closed, a certain definite movement of the warp threads takes place through the eyes of the drop wires. The warp threads are at this time placed under considerable tension so that in spite of the care with which the drop wires are finished, considerable wear upon the threads results from this continued movement back and worth, oftentimes resulting in thread breakage. faster the loom is operated the more severe the wear on the warp thread from this cause so that the elimination of this wear is an important factor in increasing the speed of operation of the loom.

One of the objects of the present invention is to provide a warp stop motion in which wear on the warp threads by the warp detector devices when the shed is opened or closed is eliminated. Another object of the invention is to provide a yielding warp stop motion, and a further object is to provide a warp stop motlon in which the warp detectors are mechanically moved back and forth with the war threads whenever the shed in o ened or c osed, thereby.eliminating all re ative movement between them, exc'e t, of course, that due to the cloth take-up.

ith these objects in View the invention loom.

The

consists in the warp stop motion hereinafter descrlbed and claimed. In the drawings in whlch two embodiments of the invention are illustrated, Fi rure 1 shows in side elevation modification of the mechanism shown in Fig. 1 as applied to the left hand side of the The illustrated embodiments of the invention are described as follows: The warp threads 10 lead from the Warp-beam 12 over the whip roll 13, over the lease rods 14:, through the warp detector 15, and then through heddles, over the breast beam, and to the take-up in the usual manner. The

' warp detectors comprise drop wires 16 supported on drop wire bars 17 which are secured at their opposite ends in the usual way to brackets 20, one of which is shown. The lease rods 14 are also secured at their opposite ends to the brackets 20 and each bracket 20 is slidably mounted upon a rod 22 which is firmly secured to the frame 23 of the loom by means of an adjustable support 24. The adjustable supports 24 are secured to brackets 25 bolted directly to the frame 23. Thus it will be observed that the warp detector devices as a unit are slidably mounted upon the frame of the loom.

The warp detectors 15 are mechanically moved back and forth with the threads each time that the shed is opened or closedby means of a mechanism which is describedas follows: The whip roll ,13 is journaled in bearing boxes 31 which are slidably received in slots 32 in arms 33 and which are yieldinglv held from movement in a forward direction by coil springs 34., The arms 33 are provided with months 35 which engage the shaft 36 and are secured thereon by set screws 38. The shaft 36 is rotatably supported in U-shaped bearings 39 formed in rearward extensions of each of the brackets 25, so that the whip5 roll 13 and associated parts are supported y the loom frame23. The shaft 36 is provided with a lever,"not shown, which cooperates with a mechanical let off motion to cause the warp beam to be moved to let off the warp so that oscillations of the whip roll 13 and arms 33 about the shaft 36 are controlled in the usual manner which forms no part of the present invention. Stop collars 40 upon the shaft 36 limit the lateral movement of the arms 33.

Links 41 provided with mouths 4:2 slip over and engage that portion of the bearing boxes 31 between the arms 33 and the side ends of the whip roll 13. The other ends of the links 41 are secured to the brackets by lock nuts 45 and bolts 46, as shown in Fig. 3. I Thus it will be observed that the warp detector devices and whip. roll 13 are rigidly connected by the links 11 so that when the shed is opened and closed the tension on the warp is transmitted directly from the whip roll 13 through the links 41 to the warp detector 15 causing the same to move forward with the warp thread. Vhen such movement takes place the bearing boxes 31 compress coil springs 34 so that when the tension upon the warp threads is relieved, the compression of the springs 34 moves the whip roll rearwardly thus causing the warp detector devices to move r'earwardly with the warp threads as the shed is closed.

This construction, in which the whip roll 13 is rotatably supported in the loom frame. is necessary in order to operate mechanical let-off motions of the Bartlett type. It will be understood, however. that the exact mounting of the whip roll 13 and associated parts upon the loom frame may be varied according to the type of let off employed.

The operation of the warp stop motion in stopping the loom onbreakage or failure of warp threads is as usual and forms no part of this invention. a,

For some purposes it may not be desirable to mechanically move the warp detector devices, and in such instances the detector is yieldingly mounted so that the friction of the warp threads against the walls of the eves in the drop wires will serve to move the warp detectors along with the thread whenever the latter is moved as the shed is opened or closed in this way eliminating the relative movement-between the warp threads and the drop wires due to the opening and closing of the shed. In Figs. 4 and 5 such construction is illustrated in which the brackets 20 are slidably mounted on the rods 22 and whose movements in one direction are resisted by coil springs 50-. One end of each coil spring abuts against a bracket 20 and the other end abuts against a stop collar 52 secured on the rod 22 by a set screw 53. A second pair of stop collars 54 serve to limit the return movement of the brackets 20 when the shed closes.

The relative movement between the warp threads and war detectors is also eliminated when the warp t reads are moved toward the front of the loom as the cloth is beaten up.

teasers This movement is more marked in the operation of weaving heavy goods, but it takes place to some extent in all weaving.

Having thus described the invention, it will be understood that the same may be embodied in other forms within the scope of the following claims 1. A loom having a frame, warp detector devices movably supported thereon, means actuated by the variations in tension of the warp threads when the filling is beaten up and as the shed is opened or closed, to move the warp detector devices with the warp threads.

2. A loom having a frame, warp detector devices movably supported thereon, a whip roll slidably mounted in the frame, a link connecting the whip roll with the Warp detector devices, and a spring arranged to resist movement of the whip roll toward the warp detector devices when the filling is beaten up and also as the shed is opened and to move the whip roll and detector devices in the opposite direction when the filling is beaten up and also as the shed is closed.

3. A loom having a frame, warp detector devices slidably mounted thereon, a spring arranged to resist movement of the warp detector devices in the forward direction and to cause movement thereof in a return direction.

4. A loom having, in combination, a frame, a warp beam, warp detector devices movably mounted on the frame, means between the warp beamand warp detector devices over which the threads pass from the warp beam to the detector devices arranged to be moved by variations in the tension on the warp threads when the filling is beaten up and when the "shed is opened and closed, and connections between the warp detector devices and said means for moving the warp detector devices to eliminate relative movement between them and the warp threads.

5. A loom. having, in combination, a frame, warp detector devices movably mounted thereon. a whip roll movably mounted upon the frame, connections between the whip roll and warp detector devices by which movements of the whip roll under the influence of variations in the ten sion on the warp threadspassing thereover are transmitted to the warp detector devices to thereby eliminate relative movement between them and the warp threads when the filling is beaten up and the shed is opened and closed.

' 6. loom having, in combination, a frame, warp detector mounted upon the frame. connections between the whip roll and warp detector devices by which movements of the whip devices movably' mounted thereon, a whip roll movably 7. A loom having, in combination a frame, 'warp detector devices movably mounted thereon and means actuated by variations in the tension on the warp threads to eliminate relative movement between the warp detector devices and the warp threads when the filling is beaten up and the shed is opened and closed, said means including a spring to yieldingly permit movement of the warp detector devices in one direction and to cause movement thereof in a return direction.

8. A loom having, in .combination, a frame, warp detector devices movably mounted thereon, a pair of'rearwa'rdly eX- tending arms, a whip roll slidably mounted in said arms, a spring cooperating with the Whip roll and said arms for resisting movement of the whip roll toward the warp 'detector devices when the filling isbeaten up and when the shed is opened, and a connector between the whip roll and warp detector devices for transmitting movement of 'the whip roll to the warp detector devices.

9. A loom having, in combination, a frame, warp detector devices slidably mounted on the frame, and a spring ar-[ ranged to permit-the warp detector devices, .to yield in a direction longitudinally of the warps when the filling is beaten up and the shed is opened and closed.

-, 10.A loom having, in combination, a

frame, lease rods movablymounted thereon,

warp detector devices movably mounted upon the frame, and means for permitting the lease rods and warp detector devices to.

yield in a direction longitudinally of the warps when the filling is beaten up and the shed is opened and closed.

11. A loom having, in combination, a frame, warp detector devices slidably mounted thereon, and means actuated by variations in the tension on the warp ,threads to move the warp detector devices to eliminate relative movement between the warp detector devices and the .warp threads when the filling is beaten up and the shed is opened and closed.

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